Injection molding machine

Abstract

To reduce footprint of an injection molding machine.SOLUTION: An injection molding machine 1 according to one embodiment of the present invention has a bed 10, an injection device 30 and a moving device 40 provided on the bed 10, and a hydraulic system 50 for operating the injection device 30 and the moving device 40. The hydraulic system 50 has a hydraulic equipment group 51 that includes a motor 60, a hydraulic pump 61, an oil tank 62, an oil filter and a valve, wherein the hydraulic equipment group 51 is located in the bed 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an injection molding machine with a hydraulically powered device. [Background technology]

[0002] An injection molding machine is equipped with various devices such as a mold clamping device, an injection device, a moving device, etc. The injection molding machine also has a hydraulic system consisting of multiple hydraulic devices, and at least one of the devices equipped in the injection molding machine is operated by the hydraulic system. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-255476 Summary of the Invention [Problem to be solved by the invention]

[0004] There is a demand for reducing the footprint of the entire injection molding machine, including the hydraulic system.

[0005] Other objects and novel features will become apparent from the description of this specification and the accompanying drawings. [Means for solving the problem]

[0006] An injection molding machine according to one embodiment includes a bed, an injection device and a moving device provided on the bed, and a hydraulic system for operating the injection device and the moving device. The hydraulic system includes a group of hydraulic devices including a motor, a hydraulic pump, an oil tank, an oil filter, and a valve, and the group of hydraulic devices is disposed within the bed. [Effects of the Invention]

[0007] According to one embodiment, the overall footprint of the injection molding machine, including the hydraulic system, is reduced. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a side view schematically showing an injection molding machine. [Figure 2] FIG. 1 is a plan view showing a part of an injection molding machine. [Figure 3] FIG. [Figure 4] FIG. 2 is a system diagram showing the configuration of a hydraulic system. [Figure 5] FIG. 4 is an explanatory diagram showing the position of the hydraulic equipment group in the left-right direction. [Figure 6A] FIG. 2 is a side view showing the operating side of the bed. [Figure 6B] FIG. 2 is a side view showing the opposite side to the operation side of the bed. [Figure 6C] FIG. 2 is a side view showing one longitudinal end of the bed. [Figure 7] FIG. 10 is a system diagram showing a modified example of the configuration of the hydraulic system. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment will be described in detail below with reference to the drawings. In all the drawings for explaining the embodiment, the same reference numerals are used to designate components and devices having the same or substantially the same functions, and in principle, repeated explanations will not be given. To avoid cluttering the drawings, components and devices shown in some drawings may be omitted in other drawings.

[0010] <Injection molding machine> Fig. 1 is a side view that schematically shows an injection molding machine 1 according to this embodiment. Fig. 2 is a plan view that shows a part of the injection molding machine 1 according to this embodiment.

[0011] The injection molding machine 1 includes a bed 10, a mold clamping unit 20, an injection unit 30, and a moving unit 40 that are provided on the bed 10, and a hydraulic system 50 for operating the injection unit 30 and the moving unit 40. More specifically, the injection molding machine 1 includes the bed 10, the mold clamping unit 20, injection units 30A and 30B, moving units 40A and 40B, and hydraulic systems 50A and 50B. From another perspective, the injection molding machine 1 includes one set of the injection unit 30A, the moving unit 40A, and the hydraulic system 50A, and another set of the injection unit 30B, the moving unit 40B, and the hydraulic system 50B. In other words, the injection molding machine 1 according to this embodiment is a twin injection molding machine.

[0012] Although not shown, an operation panel (controller) operated by an operator is provided on the side of the injection molding machine 1 shown in Fig. 1. Therefore, of the two sides of the injection molding machine 1, the side shown in Fig. 1 is the "operation side," and the side opposite to the side shown in Fig. 1 is the "anti-operation side."

[0013] The injection unit 30A, the moving unit 40A, and the hydraulic system 50A shown in Fig. 2 are provided on the operation side, while the injection unit 30B, the moving unit 40B, and the hydraulic system 50B shown in Fig. 2 are provided on the opposite operation side. Furthermore, the injection unit 30A on the operation side and the injection unit 30B on the opposite operation side are arranged parallel to each other.

[0014] The injection device 30A and the injection device 30B are the same or substantially the same device. The movement device 40A and the movement device 40B are the same or substantially the same device. The hydraulic system 50A and the hydraulic system 50B are the same or substantially the same system.

[0015] Therefore, in the following description, when there is no particular distinction between the injection unit 30A and the injection unit 30B, they may be collectively referred to as "injection unit 30." Furthermore, when there is no particular distinction between the movement unit 40A and the movement unit 40B, they may be collectively referred to as "movement unit 40." Furthermore, when there is no particular distinction between the hydraulic system 50A and the hydraulic system 50B, they may be collectively referred to as "hydraulic system 50."

[0016] Referring again to FIG. 1, molds 21 and 22 are attached to a mold clamping unit 20 of an injection molding machine 1. The mold clamping unit 20 opens and closes the attached molds 21 and 22. The injection unit 30 heats and melts a metal material (for example, magnesium or a magnesium alloy). The injection unit 30 injects the melted metal material (molten metal) into the molds 21 and 22 attached to the mold clamping unit 20. More specifically, the injection unit 30 injects the molten metal into the cavities of the molds 21 and 22. In other words, the injection molding machine 1 according to this embodiment is a metal injection molding machine.

[0017] <Bed> The bed 10 has a top plate 11 on which the mold clamping unit 20, the injection unit 30, and the moving unit 40 are mounted, and a plurality of support legs 12 that support the top plate 11. The top plate 11 has a substantially rectangular planar shape. The mold clamping unit 20 is disposed at one end of the top plate 11 in the longitudinal direction, and the injection unit 30 is disposed at the other end of the top plate 11 in the longitudinal direction. The moving unit 40 is interposed between the mold clamping unit 20 and the injection unit 30. In the following description, the longitudinal direction of the top plate 11 may be referred to as the "front-rear direction." Furthermore, the direction perpendicular to the longitudinal direction of the top plate 11 may be referred to as the "width direction" or "left-right direction." From another perspective, one widthwise side is the operating side, and the other widthwise side is the non-operating side.

[0018] The support legs 12 are arranged on the underside of the tabletop 11 and support the tabletop 11. A plurality of support legs 12 are arranged in the front-to-rear direction on at least both the left and right sides of the tabletop 11. The tabletop 11, which is supported from below by the support legs 12, is separated from the floor G by a distance corresponding to the length of the support legs 12. As a result, a space surrounded by the plurality of support legs 12 exists between the floor G and the tabletop 11. From another perspective, an installation space 13 is provided below the tabletop 11 and inside the support legs 12, in which hydraulic equipment, which will be described later, and the like are arranged. Note that the bed 10 of this embodiment is designed to be separable, taking into consideration the convenience of transportation and installation into factories.

[0019] <Mold clamping device> The mold clamping device 20 includes a fixed platen 23, a mold clamping housing 24, and a movable platen 25, which are provided on the bed 10. The fixed platen 23 and the mold clamping housing 24 are fixed to the bed 10. On the other hand, the movable platen 25 is movable in the front-rear direction on the bed 10.

[0020] The fixed platen 23 and the mold clamping housing 24 are connected to each other by a plurality of tie bars 26 that pass through the movable platen 25. More specifically, the fixed platen 23 and the mold clamping housing 24 are connected by four tie bars 26. The movable platen 25 is movable between the fixed platen 23 and the mold clamping housing 24 in the opposing direction (front-rear direction).

[0021] A link-type mold clamping mechanism 27 driven by a servo motor is provided between the mold clamping housing 24 and the movable platen 25. From another perspective, a toggle mechanism driven by a servo motor is provided between the mold clamping housing 24 and the movable platen 25.

[0022] The mold clamping mechanism 27 is equipped with a ball screw 28 that is rotationally driven by a servo motor, and moves the mold 21 attached to the movable platen 25 toward and away from the mold 22 attached to the fixed platen 23. When the mold 21 comes into contact with the mold 22, the molds 21 and 22 are closed. On the other hand, when the mold 21 moves away from the mold 22, the molds 21 and 22 are opened. The mold clamping mechanism 27 can press the mold 21 against the mold 22 while closing them to prevent the molds 21 and 22 from opening. The mold clamping mechanism 27 can be replaced with a direct pressure type.

[0023] <Injection device> The injection device 30 is composed of a heating cylinder 31, an injection nozzle 32, etc. The injection device 30 is movably provided on the bed 10, and is driven to reciprocate by a moving device 40. More specifically, the injection device 30 is driven by the moving device 40 in a direction approaching the mold clamping device 20 (forward), and also in a direction away from the mold clamping device 20 (rearward). In other words, the injection device 30 moves forward and backward (rearward) relative to the mold clamping device 20. When the injection device 30 moves forward to a predetermined position, the tip of the injection nozzle 32 comes into contact with the sprue bushing of the mold 22.

[0024] A hopper 33 is provided on the rear end side of the heating cylinder 31. The hopper 33 is a supply port for supplying a metal material to the heating cylinder 31. A screw 34 is provided inside the heating cylinder 31.

[0025] The screw 34 is driven within the heating cylinder 31. More specifically, the screw 34 is rotationally driven within the heating cylinder 31. The screw 34 is also linearly driven within the heating cylinder 31. The direction in which the screw 34 is linearly driven is the same as the direction in which the injection unit 30 moves relative to the mold clamping unit 20. In other words, the screw 34 is linearly driven within the heating cylinder 31 in a direction approaching the mold clamping unit 20 (forward) and a direction away from the mold clamping unit 20 (rearward).

[0026] 3 is a plan view of the injection device 30A. As described above, the injection device 30A and the injection device 30B are identical or substantially identical. Therefore, details of the injection device 30A will be described mainly with reference to FIG. 3, and details of the injection device 30B will also be clarified.

[0027] The screw 34 of the injection device 30A is rotationally driven by a servo motor 35a. The rotational driving force output from the servo motor 35a is transmitted to the screw 34 via a pulley 35b and the like.

[0028] The injection device 30A includes a hydraulic cylinder 36 disposed behind the screw 34. The hydraulic cylinder 36 includes a cylinder tube 36a and a piston rod 36b, and the piston rod 36b moves relative to the cylinder tube 36a due to the pressure (hydraulic pressure) of hydraulic oil supplied to the cylinder tube 36a.

[0029] The tip of the piston rod 36b of the hydraulic cylinder 36 is connected to the screw 34. Therefore, when the piston rod 36b is pushed out from the cylinder tube 36a, the screw 34 is driven forward within the heating cylinder 31. On the other hand, when the piston rod 36b is retracted into the cylinder tube 36a, the screw 34 is driven backward within the heating cylinder 31.

[0030] The heating cylinder 31 melts the supplied metal material to produce molten metal. A heater for heating the heating cylinder 31 is provided around the heating cylinder 31. In this embodiment, multiple band heaters are wrapped around the outer periphery of the heating cylinder 31. The metal material supplied to the heating cylinder 31 is heated and melted by the heat emitted from the band heaters and by shear heat generated by the rotation of the screw 34.

[0031] <Movement Device> Next, details of the mobile device 40A will be described mainly with reference to Fig. 3. As described above, the mobile device 40A and the mobile device 40B are the same or substantially the same device. Therefore, the following description of the mobile device 40A also applies to the mobile device 40B.

[0032] The moving device 40A includes a pair of hydraulic cylinders 41 arranged on both the left and right sides of the heating cylinder 31. The pair of hydraulic cylinders 41 are parallel to each other and also to the heating cylinder 31.

[0033] Each hydraulic cylinder 41 includes a cylinder tube 41a and a piston rod 41b. The piston rod 41b moves relative to the cylinder tube 41a due to the pressure (hydraulic pressure) of hydraulic oil supplied to the cylinder tube 41a. In Figures 2 and 3, the piston rod 41b is hatched (with a dot pattern) to clearly show it.

[0034] The tip of the piston rod 41b of each hydraulic cylinder 41 is fixed to the fixed platen 23 (FIG. 2) of the mold clamping unit 20. On the other hand, the cylinder tube 41a of each hydraulic cylinder 41 is fixed to the injection unit 30. Therefore, when the piston rod 41b is pushed out from the cylinder tube 41a, the injection unit 30 is driven backward. In other words, the injection unit 30 moves backward and away from the mold clamping unit 20. On the other hand, when the piston rod 41b is retracted into the cylinder tube 41a, the injection unit 30 is driven forward. In other words, the injection unit 30 moves forward and approaches the mold clamping unit 20.

[0035] <Method of manufacturing molded products> The process of manufacturing a molded product such as a metal member using the injection molding machine 1 is the same as or substantially the same as a known process. Therefore, a detailed description of the manufacturing process will be omitted, but the manufacturing process includes one or more of the following steps. (Step 1) A step of operating the moving device 40 by the hydraulic system 50 to move the injection device 30 backward. (Step 2) A step of operating the moving device 40 by the hydraulic system 50 to move the injection device 30 forward. (Step 3) A step of operating the injection device 30 by the hydraulic system 50 to move the screw 34 forward within the heating cylinder 31. (Step 4) A step of recovering all or part of the hydraulic oil supplied to the injection device 30 and the moving device 40 into the hydraulic system 50 <Hydraulic system> As described above, the hydraulic system 50 operates at least the injection device 30 and the movement device 40. From another perspective, the hydraulic system 50 supplies hydraulic oil to the injection device 30 and the movement device 40 as needed, and recovers hydraulic oil therefrom. More specifically, the hydraulic system 50 supplies hydraulic oil to the hydraulic cylinder 36 included in the injection device 30, and recovers hydraulic oil from the hydraulic cylinder 36. Furthermore, the hydraulic system 50 supplies hydraulic oil to the hydraulic cylinder 41 included in the movement device 40, and recovers hydraulic oil from the hydraulic cylinder 41.

[0036] <Hydraulic equipment and flow paths> 4 is a system diagram showing the configuration of hydraulic system 50. Hydraulic system 50 is made up of a hydraulic equipment group 51 including a plurality of hydraulic equipment, piping 52 forming a flow path (oil passage) for hydraulic oil, and the like.

[0037] Here, the cylinder tube 36a of each hydraulic cylinder 36 is divided into a front chamber 39a and a rear chamber 39b. Specifically, the internal space of the cylinder tube 36a is divided into the front chamber 39a and the rear chamber 39b by a piston 36c provided at the rear end of the piston rod 36b.

[0038] When hydraulic oil is supplied to the front chamber 39a, the hydraulic pressure acting on the front surface of the piston 36c draws the piston rod 36b into the cylinder tube 36a, and hydraulic oil is discharged from the rear chamber 39b. Conversely, when hydraulic oil is supplied to the rear chamber 39b, the hydraulic pressure acting on the back surface of the piston 36c pushes the piston rod 36b out of the cylinder tube 36a, and hydraulic oil is discharged from the front chamber 39a.

[0039] Furthermore, the cylinder tube 41a of each hydraulic cylinder 41 is divided into a front chamber 42a and a rear chamber 42b. Specifically, the internal space of the cylinder tube 41a is divided into the front chamber 42a and the rear chamber 42b by a piston 41c provided at the rear end of the piston rod 41b.

[0040] When hydraulic oil is supplied to the front chamber 42a, the hydraulic pressure acting on the front surface of the piston 41c draws the piston rod 41b into the cylinder tube 41a, and hydraulic oil is discharged from the rear chamber 42b. On the other hand, when hydraulic oil is supplied to the rear chamber 42b, the hydraulic pressure acting on the back surface of the piston 41c pushes the piston rod 41b out of the cylinder tube 41a, and hydraulic oil is discharged from the front chamber 42a.

[0041] The hydraulic equipment group 51 that constitutes the hydraulic system 50 includes a motor 60, a hydraulic pump 61, an oil tank 62, and an oil filter (suction filter 63). The motor 60 is an electric motor. More specifically, the motor 60 is a three-phase induction motor that drives at least the hydraulic pump 61. The hydraulic pump 61 pressurizes the hydraulic oil and circulates it within the hydraulic system 50. The oil tank 62 stores all or part of the hydraulic oil circulating within the hydraulic system 50. The suction filter 63 is provided between the oil tank 62 and the hydraulic pump 61, and removes foreign matter and the like from the hydraulic oil that flows into the hydraulic pump 61.

[0042] The hydraulic equipment group 51 further includes a plurality of valves. More specifically, the hydraulic equipment group 51 includes a flow rate adjustment valve 70, a directional control valve 71 for the injection device, a directional control valve 72 for the movement device, and a pressure adjustment valve 75.

[0043] The hydraulic equipment group 51 also includes an oil filter (return filter 80) and an oil cooler 81. The return filter 80 and the oil cooler 81 are arranged between the pressure regulating valve 75 and the oil tank 62 in this order.

[0044] The piping 52 that constitutes the hydraulic system 50 includes a common piping 90 , a piping 91 for the injection device, a piping 92 for the moving device, a branch piping 93 , and a return piping 94 .

[0045] The common pipe 90 forms a flow path (common flow path) that runs from the oil tank 62 through the suction filter 63 and the hydraulic pump 61 to the flow rate adjustment valve 70 .

[0046] The injection device piping 91 forms a flow path (injection device flow path) for supplying hydraulic oil to the injection device 30 and recovering the hydraulic oil from the injection device 30. More specifically, the injection device piping 91 forms a flow path for supplying hydraulic oil to the hydraulic cylinder 36 and recovering the hydraulic oil from the hydraulic cylinder 36.

[0047] Furthermore, the injection device piping 91 includes an injection device piping 91a connected to the front chamber 39a of the cylinder tube 36a, and an injection device piping 91b connected to the rear chamber 39b of the cylinder tube 36a.

[0048] The moving device piping 92 forms a flow path (moving device flow path) for supplying hydraulic oil to the moving device 40 and recovering hydraulic oil from the moving device 40. More specifically, the moving device piping 92 forms a flow path for supplying hydraulic oil to the hydraulic cylinder 41 and recovering hydraulic oil from the hydraulic cylinder 41.

[0049] Furthermore, the moving device piping 92 includes a moving device piping 92a connected to the front chamber 42a of the cylinder tube 41a, and a moving device piping 92b connected to the rear chamber 42b of the cylinder tube 41a.

[0050] The branch pipe 93 forms a flow path (branch flow path) that branches off from a flow path (common flow path) that connects the hydraulic pump 61 and the flow rate adjustment valve 70 and reaches the pressure adjustment valve 75 .

[0051] The return pipe 94 forms a flow path (return flow path) for returning the hydraulic oil discharged from the injection device 30 or the movement device 40 or the hydraulic oil that has passed through the pressure regulating valve 75 to the oil tank 62.

[0052] <Basic operation of hydraulic systems> The hydraulic pump 61 draws and discharges hydraulic oil from the oil tank 62. The hydraulic pump 61 discharges a constant amount of hydraulic oil at a constant pressure. The hydraulic oil discharged from the hydraulic pump 61 flows through a branch pipe 93 to the pressure regulating valve 75.

[0053] The pressure regulating valve 75 is a proportional valve. The pressure regulating valve 75 regulates the pressure of the hydraulic oil flowing to the flow rate regulating valve 70 to a set pressure. From another perspective, the pressure regulating valve 75 maintains the pressure of the hydraulic oil in the common flow path and the branch flow paths at a set pressure.

[0054] The flow rate regulating valve 70 is a proportional valve. The flow rate regulating valve 70 distributes the hydraulic oil, the pressure of which is adjusted by the pressure regulating valve 75, to the injection unit 30 and the movement unit 40. More specifically, the flow rate regulating valve 70 allows a set amount of hydraulic oil to flow to a directional control valve 71 connected to one end of an injection unit pipe 91 and a directional control valve 72 connected to one end of a movement unit pipe 92.

[0055] The directional control valve 71 is a solenoid-type two-way switching valve and has a plurality of ports. Specifically, the directional control valve 71 has a port P1 connected to a pipe leading to the flow rate adjustment valve 70, a port P2 connected to the injection unit pipe 91a, a port P3 connected to the injection unit pipe 91b, and a port P4 connected to the return pipe 94.

[0056] The directional control valve 71 can be switched between a position where all ports are closed (neutral position), a position where ports P1 and P2 are connected and ports P3 and P4 are connected, and a position where ports P1 and P3 are connected and ports P2 and P4 are connected.

[0057] When ports P1 and P2 are connected and ports P3 and P4 are connected, hydraulic oil flows into the front chamber 39a of the cylinder tube 36a via the injection unit piping 91a. Then, the piston rod 36b is retracted into the cylinder tube 36a, and hydraulic oil is discharged from the rear chamber 39b. The hydraulic oil discharged from the rear chamber 39b flows into the return piping 94 via the injection unit piping 91b and the directional control valve 71 (ports P3 and P4).

[0058] On the other hand, when ports P1 and P3 are connected and ports P2 and P4 are connected, hydraulic oil flows into the rear chamber 39b of the cylinder tube 36a via the injection unit piping 91b. This pushes the piston rod 36b out of the cylinder tube 36a, and hydraulic oil is discharged from the front chamber 39a. The hydraulic oil discharged from the front chamber 39a flows into the return piping 94 via the injection unit piping 91a and the directional control valve 71 (ports P2 and P4).

[0059] The directional switching valve 72 is a two-way switching valve similar to the directional switching valve 71. The directional switching valve 72 has a port P5 connected to a pipe leading to the flow rate adjustment valve 70, a port P6 connected to a moving device pipe 92a, a port P7 connected to a moving device pipe 92b, and a port P8 connected to a return pipe 94.

[0060] The directional control valve 72 can be switched between a position where all ports are closed (neutral position), a position where ports P5 and P6 are connected and ports P7 and P8 are connected, and a position where ports P5 and P7 are connected and ports P6 and P8 are connected.

[0061] When ports P5 and P6 are connected and ports P7 and P8 are connected, hydraulic oil flows into the front chamber 42a of the cylinder tube 41a via the moving device piping 92a. Then, the piston rod 41b is drawn into the cylinder tube 41a, and hydraulic oil is discharged from the rear chamber 42b. The hydraulic oil discharged from the rear chamber 42b flows into the return piping 94 via the moving device piping 92b and the directional switching valve 72 (ports P7 and P8).

[0062] On the other hand, when ports P5 and P7 are connected and ports P6 and P8 are connected, hydraulic oil flows into the rear chamber 42b of the cylinder tube 41a via the moving device piping 92b. This pushes the piston rod 41b out of the cylinder tube 41a, and hydraulic oil is discharged from the front chamber 42a. The hydraulic oil discharged from the front chamber 42a flows into the return piping 94 via the moving device piping 92a and the directional switching valve 72 (ports P6 and P8).

[0063] The hydraulic oil discharged from the hydraulic cylinder 36 or the hydraulic cylinder 41 and flowing into the return pipe 94 passes through the return filter 80 and the oil cooler 81 in that order and returns to the oil tank 62. At this time, foreign matter mixed in the hydraulic oil is captured by the return filter 80. The hydraulic oil is also cooled by heat exchange in the oil cooler 81.

[0064] <Layout of hydraulic equipment> 5 is an explanatory diagram showing the position of the hydraulic equipment group 51 in the left-right direction. As shown in FIGS. 1 and 5, the hydraulic equipment group 51 is arranged inside the bed 10. More specifically, the hydraulic equipment group 51 is arranged in an installation space 13 that is provided below the tabletop 11 and inside the support legs 12. From another perspective, the hydraulic equipment group 51 is arranged between the row of support legs 12 located on the right side (operation side) of the tabletop 11 and the row of support legs 12 located on the left side (anti-operation side) of the tabletop 11.

[0065] Furthermore, the hydraulic equipment group 51 constituting the hydraulic system 50A is disposed below the area of ​​the top plate 11 where the injection unit 30A is mounted. Moreover, the hydraulic equipment group 51 constituting the hydraulic system 50B is disposed below the area of ​​the top plate 11 where the injection unit 30B is mounted.

[0066] In other words, in the injection molding machine 1 according to this embodiment, of the multiple hydraulic devices that make up the hydraulic system 50, at least the hydraulic devices included in the hydraulic device group 51 shown in FIG. 4 are arranged within the bed 10.

[0067] Therefore, there is no need to secure a space around the bed 10 for installing the hydraulic equipment included in the hydraulic equipment group 51. As a result, the installation area of ​​the injection molding machine 1 including the hydraulic system 50 is reduced.

[0068] <Cover and control panel> Fig. 6A is a side view showing the operation side (right side) of the bed 10. Fig. 6B is a side view showing the non-operation side (left side) of the bed 10. Fig. 6C is a side view showing one longitudinal end of the bed 10.

[0069] A pair of covers 101, 102 facing each other across a hydraulic equipment group 51 (FIG. 5) are provided on both sides (operation side and non-operation side) of the top plate 11. Control units 103, 104 are provided between one longitudinal end side of one cover 101 and one longitudinal end side of the other cover 102.

[0070] The control unit 103 houses various control boards for controlling the operation side devices such as the injection unit 30A and the movement unit 40A, while the control unit 104 houses various control boards for controlling the non-operation side devices such as the injection unit 30B and the movement unit 40B.

[0071] The control units 103 and 104 are arranged side by side in the left-right direction, adjacent to each other with almost no gaps between them. As a result, three sides of the installation space 13 (FIGS. 1 and 5) in which the hydraulic equipment group 51 is arranged are closed by the covers 101 and 102 and the control units 103 and 104. From another perspective, three sides of the space below the top plate 11 are closed by the covers 101 and 102 and the control units 103 and 104.

[0072] Therefore, the operating noise of the hydraulic equipment group 51 is less likely to leak outside the bed 10, reducing the noise of the injection molding machine 1. In other words, the covers 101, 102 and the control units 103, 104 function as a soundproof or sound-insulating wall.

[0073] The covers 101 and 102 are fixed to the bed 10 with bolts and can be removed as needed. Soundproofing or sound-absorbing materials may be added to the covers 101 and 102 or the control units 103 and 104 to improve the soundproofing or sound-blocking effects. The covers 101 and 102 may be made separable, or openings may be provided at any positions on the covers 101 and 102. Furthermore, when openings are provided in the covers 101 and 102, doors may be provided at the openings.

[0074] The invention made by the present inventor has been specifically described above based on the embodiments, but it goes without saying that the present invention is not limited to the above embodiments and can be modified in various ways without departing from the spirit of the invention. For example, the hydraulic equipment included in the hydraulic equipment group 51 arranged in the bed 10 is not limited to the hydraulic equipment shown in Figure 4. Figure 7 is a system diagram showing a modified configuration of the hydraulic system 50.

[0075] In the hydraulic system 50 shown in FIG. 7, a pressure reducing valve 73 and a pilot check valve 74 are provided between the flow rate adjusting valve 70 and the directional switching valve 72 for the moving device.

[0076] The pressure reducing valve 73 adjusts the pressure of the hydraulic oil supplied to the hydraulic cylinder 41 via the directional control valve 72 to a set pressure.

[0077] The pilot check valve 74 retains hydraulic oil in the moving device piping 92 as needed. For example, in the above-mentioned injection process, it is necessary to maintain the tip of the injection nozzle 32 in contact with the sprue bushing of the mold 22. At this time, the pilot check valve 74 is closed to retain hydraulic oil in the moving device piping 92. From another perspective, it temporarily restricts the discharge of hydraulic oil from the hydraulic cylinder 41.

[0078] Furthermore, even in the hydraulic system 50 (FIG. 4) that does not have a valve equivalent to the pilot check valve 74, the tip of the injection nozzle 32 can be kept in contact with the sprue bushing of the mold 22 by continuing to operate the hydraulic pump 61.

[0079] The injection device 30 can be replaced with an injection device (resin injection device) that injects molten resin into the molds 21 and 22 attached to the mold clamping device 20.

[0080] The injection molding machine 1 in the above embodiment is equipped with two sets of injection units 30 and movement units 40. However, there is also an embodiment in which a single set of injection units and movement units is provided. In other words, the present invention is also applicable to a single injection molding machine, and when applied, the same effects as those described above are achieved. [Explanation of symbols]

[0081] 1 injection molding machine 10 beds 11 Top plate 12 Support legs 13 Installation space 20 Mold clamping device 21,22 Mold 23 Fixed plate 24 Mold clamping housing 25 Movable plate 26 Tie bar 27 Mold clamping mechanism 30,30A,30B injection device 31 Heating cylinder 32 injection nozzle 33 Hopper 34 screw 35a servo motor 35b pulley 36 Hydraulic cylinder 36a Cylinder tube 36b Piston rod 36c piston 39a Antechamber 39b Posterior chamber 40,40A,40B Mobile device 41 Hydraulic cylinder 41a Cylinder tube 41b Piston rod 41c piston 42a Antechamber 42b Posterior chamber 50, 50A, 50B Hydraulic system 51 Hydraulic equipment group 52 Piping 60 motor 61 Hydraulic pump 62 Oil Tank 63 Suction filter 70 Flow control valve 71,72 Directional valve 73 Pressure reducing valve 74 Pilot check valve 75 Pressure Regulating Valve 80 Return filter 81 Oil cooler 90 Common piping 91,91a,91b Piping for injection device 92,92a,92b Piping for mobile equipment 93 Branch piping 94 Return pipe 101,102 Cover 103,104 Control unit G floor P1~P8 ports

Claims

1. The bed and a mold clamping device provided on the bed; an injection device movably provided on the bed; a moving device that moves the injection device; an operation panel operated by an operator; a control unit that houses a control board; a hydraulic system for operating the injection device and the movement device, the hydraulic system includes a group of hydraulic equipment located within the bed, including a motor, a hydraulic pump, an oil tank, an oil filter, and a valve; the hydraulic equipment group is disposed below the top plate of the bed on which the mold clamping device, the injection device, and the moving device are mounted, a first cover and a second cover that face each other with the hydraulic equipment group interposed therebetween are provided on both sides of the top plate, the control unit is provided between one end side of the first cover in the longitudinal direction and one end side of the second cover in the longitudinal direction, an injection molding machine, wherein a space below the top plate in which the hydraulic equipment group is arranged is closed on three sides by the first cover, the second cover, and the control unit.

2. 2. The injection molding machine according to claim 1, The bed has a plurality of support legs that support the top plate, The hydraulic equipment group is disposed below the top plate and inside the support legs.

3. 3. The injection molding machine according to claim 2, The hydraulic equipment group is disposed below an area of ​​the top plate where the injection unit is mounted.

4. In the injection molding machine according to any one of claims 1 to 3, The hydraulic system includes: a first flow path for supplying hydraulic oil to the injection device and recovering hydraulic oil from the injection device; a second flow path for supplying hydraulic oil to the moving device and recovering hydraulic oil from the moving device; The valves constituting the hydraulic equipment group include: a flow rate adjustment valve that distributes the hydraulic oil discharged from the hydraulic pump to the first flow path and the second flow path; a first directional switching valve provided in the first flow path; a second directional switching valve provided in the second flow path.

5. 5. The injection molding machine according to claim 4, an injection molding machine, wherein the valves constituting the hydraulic equipment group further include a pressure regulating valve that regulates the pressure of the hydraulic oil supplied to the flow rate regulating valve;

6. 6. The injection molding machine according to claim 5, The oil filter constituting the hydraulic equipment group includes: a first oil filter provided between the oil tank and the hydraulic pump; a second oil filter disposed between the pressure regulating valve and the oil tank.

7. In the injection molding machine according to any one of claims 1 to 6, a first ejection device and a first movement device provided on the bed; a second ejection device and a second movement device provided on the bed; a first hydraulic system for actuating the first injection device and the first movement device; a second hydraulic system for actuating the second injection device and the second movement device, an injection molding machine, wherein the first injection device and the first moving device, and the second injection device and the second moving device are arranged parallel to each other on the bed;

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